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Lyhoalepis duckhoai is an arthrodire placoderm fish, which lived during the Early Devonian period in what is now Central Vietnam. Its fossils are found in the Emsian-aged Ly Hoa Formation.

References

1. Janvier, P., Tông-Dzuy, T., Doàn Nhât, T., 1994. Devonian fishes from Viet Nam: new data form CentralViet Nam and their palaeobiogeographical significance. Proceedings of the International Symposium on Stratigraphic Correlation of Southeast Asia, Bangkok, pp. 69–74.
2. Janvier, P., Tông-Dzuy, T., Phuong, T.H., Doàn Nhât, T., 1997. The Devonian vertebrates (Placodermi, Sarcopterygii) from Central Vietnam and their bearing on the Devonian palaeogeography of Southeast Asia. Journal of Asian Earth Sciences 15, 393–406.

v t e Arthrodira
Kingdom: Animalia Phylum: Chordata Subphylum: Vertebrata Infraphylum: Gnathostomata Class: "Placodermi" Gnathostomata see Gnathostomata Placodermi see Placodermi Arthrodira see below↓
Arthrodira Arthrodira Aethaspis Aleosteus Anarthraspis Antarctaspis Baringaspis Bryantolepis Erikaspis Eskimaspis Heightingtonaspis Kujdanowiaspis Lataspis Lehmanosteus Mediaspis Proaethaspis Qataraspis Sigaspis Simblaspis Yujiangolepis Wuttagoonaspidae Wuttagoonaspis Yiminaspis Phyllolepida Gavinaspis Phyllolepididae Austrophyllolepis Cobandrahlepis Cowralepis Phyllolepis Placolepis Yurammia Actinolepidae Actinolepis Ailuracantha Bollandaspis Szelepis Phlyctaenioidei Dicksonosteus Phlyctaeniidae Aggeraspis Arctaspis Barwickosteus Cartieraspis Diadsomaspis Elegantaspis Gaspeaspis Grifftaylor Heterogaspis Huginaspis Kolpaspis Kueichowlepis Lyhoalepis Neophlyctaenius Pageauaspis Phlyctaenius Prosphymaspis Stipatosteus Arctolepididae Arctolepis Heintzosteus Huginaspis? Kueichowlepis? Groenlandaspididae Africanaspis Boomeraspis Cosmacanthus Groenlandaspis Mithakaspis Mulgaspis Tiaraspis Turrisaspis Williamsaspididae Elvaspis Williamsaspis Brachythoraci Antineosteus Dhanguura? Gemuendenaspis Maideria Xiangshuiosteus? Holonematidae Artesonema Belemnacanthus Bimbianga Deirosteus Deveonema Gyroplacosteus Holonema Megaloplax Rhenonema Tropidosteus Tropinema Homostiidae Angarichthys Cathlesichthys Dhanguura? Euleptaspis Euleptaspis Luetkeichthys Migmatocephala Antineosteus Atlantidosteus Homosteus Tityosteus Buchanosteidae Arenipiscis Buchanosteus Burrinjucosteus Errolosteus Exutaspis Goodradigbeeon Narrominaspis Parabuchanosteus Toombsosteus Taemasosteus Uralosteus Eubrachythoraci see below↓
Eubrachythoraci Coccosteomorphi Coccosteoidea Coccosteidae Belgiosteus Clarkeosteus Coccosteus Dickosteus Jiuchengia Livosteus Millerosteus Protitanichthys Watsonosteus Panxiosteidae Janiosteus Kimberleyichthys? Panxiosteus Plourdosteus? Incisoscutoidea Belosteus? Compagopiscis Cyrtosteus? Harrytoombsia? Mcnamaraspis? Parabelosteus? Torosteus Trematosteus Camuropiscidae Camuropiscis Fallacosteus Incisoscutum Latocamurus Rolfosteus Tubonasus Pachyosteomorphi Leptosteus Rhachiosteus Dunkleosteoidea Dunkleosteus Eastmanosteus Golshanichthys Hussakofia Kiangyousteus Westralichthys Xiangshuiosteus? Heterosteidae Herasmius Heterosteus Yinostius Aspinothoracidi Bruntonichthys Bullerichthys Bungartius Dinichthys Dinomylostoma Erromenosteus Hadrosteus Holdenius Kendrickichthys Mylostoma Squamatognathus Tafilalichthys Tapinosteus Titanichthys Brachydeiridae Brachydeirus Oxyosteus Synauchenia Selenosteidae Alienacanthus Amazichthys Brachyosteus Braunosteus Draconichthys Enseosteus Gorgonichthys Gymnotrachelus Heintzichthys Melanosteus Microsteus Pachyosteus Paramylostoma Phymosteus Rhinosteus Selenosteus Stenosteus Walterosteus

v t e "Placodermi"
Kingdom: Animalia Phylum: Chordata Subphylum: Vertebrata Infraphylum: Gnathostomata Gnathostomata see Gnathostomata Placodermi see below↓ Placodermi
Acanthothoraci* Hagiangella Palaeacanthaspidae* Arabosteus Dobrowlania Kimaspis Kolymaspis Kosoraspis Palaeacanthaspis Radotina Romundina Sudaspis Tlamaspis Weejasperaspididae Murrindalaspis Weejasperaspis Petalichthyida Diandongpetalichthys Neopetalichthys Quasipetalichthyidae Eurycaraspis Pauropetalichthys Quasipetalichthys Macropetalichthyidae Ellopetalichthys Epipetalichthys Lunaspis Macropetalichthys Notopetalichthys Shearsbyaspis Tongdzuylepis Wijdeaspis Ptyctodontida Austroptyctodus Campbellodus Chelyophorus Ctenurella Denisonodus Destnoporella Eczematolepis Goniosteus Kimbryanodus Materpiscis Meeksiella Palaeomylus Ptyctodopsis Ptyctodus Rhamphodopsis Rhynchodus Rhenanida Asterosteus Bolivosteus Gemuendina Jagorina Nefudina Ohioaspis Antiarchi see Antiarchi Arthrodira see Arthrodira Others "maxillate placoderms" Bianchengichthys Entelognathus Qilinyu Silurolepis? Brindabellaspis Holopetalichthys Minjinia Pseudopetalichthys Stensioella Xiushanosteus
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